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PDF ADP197 Data sheet ( Hoja de datos )
| Número de pieza | ADP197 | |
| Descripción | 3A Logic Controlled High-Side Power Switch Mobile phones | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Low RDSON of 12 mΩ
Low input voltage range: 1.8 V to 5.5 V
3 A continuous operating current at 70°C
1.2 V logic compatible enable input
Low 18 μA quiescent current, VIN < 3 V
Low 30 μA quiescent current, VIN = 5 V
Overtemperature protection
Ultralow shutdown current: <1 μA
Ultrasmall 1.0 mm × 1.5 mm, 6-ball, 0.5 mm pitch WLCSP
APPLICATIONS
Mobile phones
Digital cameras and audio devices
Portable and battery-powered equipment
GENERAL DESCRIPTION
The ADP197 is a high-side load switch designed for operation
between 1.8 V and 5.5 V. This load switch provides power domain
isolation, helping extended power domain isolation. The device
contains a low on-resistance, N-channel MOSFET that supports
more than 3 A of continuous current and minimizes power loss.
The low 18 μA quiescent current and ultralow shutdown current
make the ADP197 ideal for battery-operated portable equipment.
The built-in level shifter for enable logic makes the ADP197
compatible with many processors and GPIO controllers.
5 V, 3 A Logic Controlled
High-Side Power Switch
ADP197
TYPICAL APPLICATIONS CIRCUIT
VIN VOUT
+
–
GND
ON
EN OFF
CHARGE PUMP
AND
SLEW RATE
CONTROL
LOAD
OVERTEMPERATURE
PROTECTION
ADP197
Figure 1.
Overtemperature protection circuitry activates if the junction
temperature exceeds 125°C, thereby protecting itself and
downstream circuits from potential damage.
In addition to operating performance, the ADP197 occupies
minimal printed circuit board (PCB) space with an area of less
than 1.5 mm2 and a height of 0.60 mm.
The ADP197 is available in an ultrasmall, 1 mm × 1.5 mm,
6-ball, 0.5 mm pitch WLCSP.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
12
A VIN
VOUT
ADP197
B VIN
VOUT
C EN
GND
ADP197
TOP VIEW
(Not to Scale)
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic Description
A1, B1
VIN Input Voltage.
A2, B2
VOUT
Output Voltage.
C1 EN Enable Input. Drive EN high to turn on the switch and drive EN low to turn off the switch.
C2
GND
Ground.
Rev. 0 | Page 5 of 16
5 Page 
APPLICATIONS INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP197 is designed for operation with small, space-saving
ceramic capacitors but functions with most commonly used capa-
citors when the effective series resistance (ESR) value is carefully
considered. The ESR of the output capacitor affects the response
to load transients. A typical 1 μF capacitor with an ESR of 0.1 Ω
or less is recommended for good transient response. Using a larger
value of output capacitance improves the transient response to
large changes in load current.
Input Bypass Capacitor
Connecting at least 1 μF of capacitance from VIN to GND reduces
the circuit sensitivity to the printed circuit board (PCB) layout,
especially when high source impedance or long input traces are
encountered. When greater than 1 μF of output capacitance is
required, increase the input capacitor to match it.
GROUND CURRENT
The major source for ground current in the ADP197 is the internal
charge pump for the FET drive circuitry. Figure 24 shows the
typical ground current when VEN = VIN, and varies from 1.8 V
to 5.5 V.
50
50mA
45
100mA
200mA
500mA
40 1000mA
3000mA
35
30
25
20
15
10
5
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Figure 24. Ground Current vs. Load Current, Different Input Voltages (VIN)
ENABLE FEATURE
The ADP197 uses the EN pin to enable and disable the VOUT
pin under normal operating conditions. As shown in Figure 25,
when a rising voltage (VEN) on the EN pin crosses the active
threshold, VOUT turns on. When a falling voltage (VEN) on
the EN pin crosses the inactive threshold, VOUT turns off.
ADP197
4.0
VOUT AT 3.6V
3.5
3.0
2.5
2.0
VEN FALLING
VEN RISING
1.5
1.0
0.5
0
0 0.2 0.4 0.6 0.8 1.0 1.2
ENABLE VOLTAGE (V)
Figure 25. Typical EN Operation
As shown in Figure 25, the EN pin has hysteresis built into it.
This prevents on/off oscillations that can occur due to noise on
the EN pin as it passes through the threshold points.
The EN pin active/inactive thresholds derive from the VIN voltage;
therefore, these thresholds vary with the changing input voltage.
Figure 26 shows the typical EN active/inactive thresholds when
the input voltage varies from 1.8 V to 5.5 V.
1.2
EN RISE
EN FALL
1.0
0.8
0.6
0.4
0.2
0
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
INPUT VOLTAGE (V)
Figure 26. Typical EN Thresholds vs. Input Voltage (VIN)
TIMING
Turn-on delay is defined as the interval between the time that
VEN exceeds the rising threshold voltage and when VOUT rises to
~10% of its final value. The ADP197 includes circuitry that has a
typical 1 ms turn-on delay and a controlled rise time to limit the
VIN inrush current. As shown in Figure 27 and Figure 28, the turn-
on delay is nearly independent of the input voltage.
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADP197.PDF ] | |
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